Chitosan-functionalized sodium alginate-based electrospun nanofiber membrane for As (III) removal from aqueous solution. Issue 6 (December 2021)

• Record Type: Journal Article
• Authors: Talukder, Md Eman; Pervez, Md. Nahid; Jianming, Wang; Gao, Ziwei; Stylios, George K.; Hassan, Mohammad Mahbubul; Song, Hongchen; Naddeo, Vincenzo
• Is Part Of: Journal of environmental chemical engineering. Volume 9:Issue 6(2021)
• Publication Date: 2021-12
• Subjects: Electrospinning -- Nanofiber membranes -- Surfaced modification -- Nanoadsorbents -- Arsenic; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2021.106693
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: Environment-friendly chitosan-modified-poly(vinyl alcohol) or (PVA)/sodium alginate (SA) electrospun nanofiber membrane (ENM) adsorbent was prepared for the removal of As(III) from an aqueous solution. The chitosan(CS)-functionalized-PVA/SA ENM (CS-f-PVA/SA) was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and X-Ray diffraction (XRD). The CS-f-PVA/SA ENM showed the maximum As (III) adsorption capacity at neutral pH (540.40 mg g −1 ). The adsorption experiments were conducted by varying the initial pH of the arsenic solutions and also in the presence of different coexisting anions, such Cl - and F -, SO4 2−, and PO4 3− . Moreover, the kinetic studies were performed to depict the rate of As(III) sorption onto CS-f-PVA/SA ENM. The As(III) adsorption reached equilibrium within 90 min, which well fitted to the pseudo-second-order kinetic model. The initial pH of arsenic solutions greatly affected the adsorption efficiency but the presence of competing anions in arsenic solutions showed a moderate effect on the arsenic adsorption. The FTIR and XRD analyses suggest that–NH2, –OH, and C–O functional groups of CS-f-PVA/SA ENM are responsible for As(III) uptake. The prepared CS-f-PVA/SA ENM can be easily regenerated using 0.003 M NaOH, and the As(III) removal rate was still above 90–50% after ten successive adsorption-desorption cycles. Thus, such a nanofiber-based adsorbent is quite promising for the removal of As(III) from potable water and can be beneficial in combating the current challenges of arsenic pollution. Graphical Abstract: ga1 Highlights: An environment-friendly electrospun nanofiber membrane was prepared. The role of chitosan was explored by coating onto poly (vinyl alcohol)/sodium alginate nanofiber. CS-f-PVA.SA ENM showed the maximum adsorption capacity (540.54 mg g −1 ) of As (III) at the neutral pH. Regeneration stability up to ten successive cycles was investigated.